Patent US3926431A successfully refreshed from Google Patents.
US3926431A
Expired / Lapsed
US
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Racket
Assignee: John Z Delorean Corp
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Filing: 1974-07-05
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Granted: 1975-12-16
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Expires: 1994-07-05
Abstract
Abstract A racket having a pair of stringed ball-engaging surfaces wherein one of said surfaces is ''''smooth'''' while the other surface is ''''rough'''' whereby different amounts of spin may be imparted to a ball depending on which racket surface is presented to the ball.
Inventors
- 👤 John Z Delorean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:50
CPC Classifications
A; A63; A63B; A63B51/00; A63B51/02; A63B51/06; A63B51/026
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
A racket including a frame and a plurality of string elements supported upon said frame in a taut open weave pattern, each string element including first and second discrete portions extending substantially throughout the length thereof, the first discrete portions of said string elements coacting to form a first ball-engaging surface, the second discrete portions of said string elements coacting to form a second ball-engaging surface, said first ball-engaging surface having a high coefficient of friction relative to said second ball-engaging surface.
Claim 2
Dependent Claim
82 words
A racket including a frame and a plurality of string elements supported upon said frame in a taut open weave pattern, each string element including first and second discrete portions extending substantially throughout the length thereof, the first discrete portions of said string elements coacting to form a first ball-engaging surface, the second discrete portions of said string elements coacting to form a second ball-engaging surface, said first ball-engaging surface having a high coefficient of friction relative to said second ball-engaging surface.
Claim 3
Dependent Claim
23 words
A racket as set forth in claim 1 in which each string element is preformed to provide said first and second discrete portions.
Claim 4
Dependent Claim
46 words
A racket as set forth in claim 2 in which the string elements have a generally triangular cross section, one side of said string element comprising said second discrete portion, the apex opposite the said one side of said string element comprising said first discrete portion.
Claim 5
Dependent Claim
48 words
A racket as set forth in claim 3 in which said frame includes a plurality of triangularly shaped openings formed therein and corresponding in shape and size to the triangular cross section of said string elements, eAch string element being supported between a pair of aligned frame openings.
Claim 6
Dependent Claim
21 words
A racket as set forth in claim 4 in which said frame includes a median plane intersecting said triangularly shaped openings.
Claim 7
Dependent Claim
88 words
A racket as set forth in claim 3 in which said frame includes a median plane, first and second sets of aligned triangularly shaped openings formed in said frame and disposed on opposite sides of said median plane, said openings corresponding in size and shape to the triangular cross sections of said string elements, each string element being supported between aligned openings of said first and second sets of frame openings whereby the first and second ball-engaging surfaces are respectively spaced on opposite sides of said median plane.
Claim 8
Dependent Claim
36 words
A racket as set forth in claim 1 in which each string element has a generally circular cross section, the first and second discrete portions of each string element comprehending substantially one-half of the string circumference.
Claim 9
Dependent Claim
30 words
A racket as set forth in claim 7 in which the first discrete portion of each string element has a substantially greater coefficient of friction than the second discrete portion.
Claim 10
Dependent Claim
24 words
A racket as set forth in claim 7 in which a particulate material is adhered to the first discrete portion of each string element.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |